<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        *{
            margin: 0;
            padding: 0;
        }
        ul{
            list-style: none;
        }
        a{
            text-decoration: none;
        }

        /* 头部样式 */
        .header{
            height: 80px;
            background-color: #fff;
        }
        .header-c{
            width: 1200px;
            height: 100%;
            background-color: pink;
            margin: 0 auto;
        }
        .header .logo{
            float: left;
            width: 200px;
            height: 100%;
            background-color: orange;
        }
        .header .nav{
            float: right;
            width: 400px;
            height: 100%;
            background-color: blue;
        }

        .header .nav-item{
            float: left;
        }

        /* 内容部分 */
        .main{
            /* height: 1000px; */
            background-color: gray;
           
        }
        .main-c{
            width: 1200px;
            /* height: 100%; */
            background-color: red;
            margin: 0 auto;
            padding-bottom: 50px;
        }
        .title{
            height: 60px;
            background-color: green;
        }
        .talk-list{
            overflow: hidden;
        }
        .talk-item{
            float: left;
            width: 550px;
            height: 300px;
            background-color: #fff;
            margin-right: 100px;
            margin-bottom: 50px;
        }
        .talk-item.mr0{
            margin-right: 0;
        }

        .btn{
            width: 140px;
            height: 60px;
            background-color: orange;
            margin:0 auto;

        }
        /* 底部 */
        .footer{
            height: 200px;
            background-color: #333;
        }
        .footer-c{
            width: 1200px;
            height: 100%;
            margin: 0 auto;
            background-color: orange;
        }

        .ads{
            float: left;
            width: 200px;
            height: 200px;
            background-color: gray;
            margin-right: 50px;
        }
        .concat{
            float: left;
            width: 200px;
            height: 200px;
            background-color: gray;
            margin-right: 30px;
        }
        .zx{
            float: left;
            width: 200px;
            height: 200px;
            background-color: gray;
            margin-right: 40px;
        }

        .qr{
            float: left;
            width: 200px;
            height: 200px;
            background-color: gray;
        }
    </style>
</head>
<body>
    <div class="header">
        <div class="header-c">
            <a href="#" class="logo"></a>
            <ul class="nav">
                <li class="nav-item">
                    首页
                </li>
                <li class="nav-item">
                    ui
                </li>
                <li class="nav-item">
                    前端
                </li>
            </ul>
        </div>
    </div>
    <div class="main">
        <div class="main-c">
            <div class="title">
                <span>全部</span>
                <span>ui</span>
                <span>前端</span>
            </div>

            <ul class="talk-list">
                <li class="talk-item">

                </li>
                <li class="talk-item mr0">
                    
                </li>
                <li class="talk-item">
                    
                </li>
                <li class="talk-item mr0">
                    
                </li>
            </ul>

            <div class="btn">普通按钮</div>
        </div>
    </div>
    <div class="footer">
        <div class="footer-c">
            <div class="ads">

            </div>
            <div class="concat">


            </div>
            <div class="zx">

            </div>
            <div class="qr">

            </div>
        </div>
    </div>
    
</body>
</html>